Thallus placodioid, orbicular and effigurate, closely to ± loosely attached, margins ± lobate. Upper surface matt to ± scabrid, often markedly rimose- fissured centrally. Medulla white, hyphae mainly in a fan-like arrangement. Photobiont blue-green, and ?, concentrated in the upper part of thallus. Lower surface dark, decorticate, ± rhizinate. Apothecia innate or emergent and then ± sessile, rounded, disc plane or subconcave, red-brown or brownish, thalline exciple rudimentary or rarely well-developed. Asci with amyloid cap or ring-structure, 8-spored. Paraphyses distinctly septate, branched to anastomosing. Ascospores simple to multiseptate, colourless. Pycnidia large, of two types, either locular or with a central hollow, and cerebriform. Conidiophores short-celled producing in both types rod-shaped conidia both terminally and laterally.